- Conclusions:Focused ultrasound has therapeutic effect on dermis but no accumulated damage to the skin treated at regular intervals.
- accumulated damage mechanics(ADM)
- In the analysis, the total strain amplitude as well as the rules of accumulative damage are used for the research of the fatigue life.
- The results as follow:The damage duration in the area was from September to November of 2004,and the accumulative damage rate was 34.25%,especially during September of 2004,which was up to 17.42%.
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